To the Editor:

Re “What Makes a Shooter Do It?” (news analysis, Sunday Review, July 26):

A common denominator in the growing incidence of mass shootings—the sociopathic dysfunction of the perpetrators—mandates the legislated imposition of universal and exacting background checks upon all would-be firearms buyers.

Yet, because of fear of gun-lobby retribution, congressional inaction prevails: a betrayal of the general welfare akin to acquiescence, if not outright complicity, in the proliferating onslaught.

RICHARD BOYCE

San Francisco